Water Quality And System Preparation; Minimum Amount Of Water Required In The Space Heating/Cooling Circuit; How To Access Internal Components And Control And Electrical Box - Mitsubishi Electric ecodan ERST20 series Installationshandbuch

4
installation

4.2 Water Quality and System Preparation

General
• The water in both primary and sanitary circuit should be clean and with pH value
of 6.5-8.0
• The followings are the maximum valves;
Calcium: 100mg/L, Ca hardness: 250mg/L
Chlorine: 100mg/L, Copper: 0.3mg/L
Iron/Manganese: 0.5mg/L
• Other constituents should be to European Directive 98/83 EC standards.
• In known hard water areas, to prevent/minimise scaling, it is beneficial to restrict
the routine stored water temperature (DHW max. temp.) to 55°C.
Anti-Freeze
Anti-freeze solutions MUST use propylene glycol with a toxicity rating of Class 1 as
listed in Clinical Toxicology of Commercial Products, 5th Edition.
note:
1. ethylene glycol is toxic and must nOt be used in the primary water
circuit in case of any cross-contamination of the potable circuit.
2. For 2-zone valve On/OFF control, propylene glycol MUSt be used.
new installation (primary water circuit)
• Before connecting outdoor unit, thoroughly cleanse pipework of building debris,
solder etc using a suitable chemical cleansing agent.
• Flush the system to remove chemical cleanser.
• For all packaged model systems add a combined inhibitor and anti-freeze
solution to prevent damage to the pipework and system components.
• For split model systems the responsible installer should decide if anti-freeze
solution is necessary for each site's conditions. Corrosion inhibitor however
should always be used.
existing installation (primary water circuit)
• Before connecting outdoor unit the existing heating circuit MUST be chemically
cleansed to remove existing debris from the heating circuit.
• Flush the system to remove chemical cleanser.
• For all packaged model systems, and the split model or PUMY system without
booster heater, add a combined inhibitor and anti-freeze solution to prevent
damage to the pipework and system components.
• For split model systems the responsible installer should decide if anti-freeze
solution is necessary for each site's conditions. Corrosion inhibitor however
should always be used.
When using chemical cleansers and inhibitors always follow manufacturer's
instructions and ensure the product is appropriate for the materials used in
the water circuit
How to access internal Components and Control and
electrical Box
<A> Opening the front panel
1. Remove the two lower screws.
2. Slide front panel upwards to slightly and open carefully.
3. Disconnect the relay connector connecting main remote controller cable and the
control board cable.
<B> Accessing the back of the control and electrical box
The control and electrical box has 3 holding screws and is hinged on the right hand side.
1. Remove the holding screws on the control and electrical box.
2. The control and electrical box can then be swung forward on the right hand
hinges.
note:
After servicing, re-secure all cables using straps provided. reconnect main
remote controller cable to its relay connector. replace front panel and re-
secure screws at base.
Minimum amount of water required in the space
heating/cooling circuit
Outdoor heat pump unit
Packaged model PUHZ-W50
PUHZ-W85
PUHZ-W112
PUHZ-HW112
PUHZ-HW140
Split model SUHZ-SW45
PUHZ-SW40
PUHZ-SW50
PUHZ-FRP71
PUHZ-SW75
PUHZ-SW100
PUHZ-SW120
PUHZ-SHW80
PUHZ-SHW112
PUHZ-SHW140
PUMY-P112
PUMY-P125
PUMY-P140
<Table 4.2.1>
note:
For 2-zone temperature control system, the value in the table above
excludes the amount of stored water in zone2.
<A>
Open
Front
panel
Screws
<Figure 4.2.1>
Minimum water quantity [l]
29
37
48
48
60
17
17
22
32
32
43
54
34
48
60
80
80
80
<B>
Hinges
Screws
12